压电过滤材料的传感性能及其在口罩中的应用  

Sensing property of piezoelectric filter material and its application in masks

作　　者：王晨 赫伟东 毛宁[1] 柳静献[1] WANG Chen;HE Weidong;MAO Ning;LIU Jingxian(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《煤炭学报》2024年第7期3017-3024,共8页Journal of China Coal Society

基　　金：国家重点研发计划资助项目(2022YFC2503200,2022YFC2503201);国家自然科学基金资助项目(52304210)。

摘　　要：在劳动保护领域,实时监测劳动者的生理健康状态受到越来越多的关注。因呼吸中包含大量生理学信息,开发具有传感功能的可穿戴设备用于监测佩戴者呼吸状态成为研究热点。传统的商用呼吸监测装置价格昂贵、体积大、不易携带,限制了其在一线生产场所的使用,例如高粉尘质量浓度的矿山作业环境。为此,基于聚偏氟乙烯(PVDF)的压电性能,利用静电纺丝技术制备出具有传感性能的柔性PVDF纳米纤维膜,将高透气性碳纤维毡与PVDF纳米纤维膜设计为具有三明治结构的传感模块并嵌入到口罩中。传感模块将呼吸气流产生的机械能转化为电能,通过对电信号数据的采集和分析,完成对呼吸强度和呼吸频率的实时监测。结果表明:嵌有传感模块的口罩在不同呼吸状态下产生的压电信号有明显差异,在低强度(15 L/min)、中强度(50 L/min)和高强度(85 L/min)3种呼吸状态下,输出压电电压峰值分别为300、700、1100 mV,电压峰值出现频率分别为18、16、14次/min。因此,基于压电信号电压峰值及其出现频率的分析,可以实现佩戴者呼吸强度和呼吸频率等呼吸参数的实时监测。此外,研究通过XRD、FT-IR、TG等分析方法确定了PVDF纳米纤维膜的压电性与其β相晶体含量有关,为进一步改善PVDF纳米纤维膜的压电性能提供了依据。研发的具有传感功能的口罩可用于矿山工人劳作状态的实时呼吸监测,在工人工作状态异常时反馈给管理人员以便于及时采取处理措施。In the field of labor protection,the real-time monitoring of workers’physical health status has received a lot of attention.Because breathing contains a lot of physiological information,the development of wearable devices with sensing functions for monitoring the wearer’s respiratory status has become a research hotspot.Traditional commercial respiratory monitoring devices are expensive,bulky,and not easy to be carried,limiting their use in front-line production sites,such as high dust mass concentration mines’operating environments.In view of this situation,based on the piezoelectric properties of polyvinylidene fluoride(PVDF),a flexible PVDF nanofiber membrane with sensing properties was prepared using electrospinning technology.The high permeability carbon fiber felt and PVDF nanofiber membrane were designed as a sandwich structure.The sensing module was embedded in the mask.The sensor module converted the mechanical energy generated by the respiratory airflow into electrical energy.Through the collection and analysis of electrical signal data,the real-time monitoring of respiratory intensity and respiratory frequency was completed.The results show that the piezoelectric signals generated by the mask embedded with the sensing module are significantly different under different breathing states.Under the three breathing states of low intensity(15 L/min),medium intensity(50 L/min)and high in-tensity(85 L/min),the output piezoelectric voltage peaks are 300,700 and 1100 mV,respectively,and the frequency of voltage peaks is 18,16 and 14 times/min,respectively.Therefore,based on the analysis of the peak voltage and its fre-quency of the piezoelectric signal,the real-time monitoring of respiratory parameters such as the wearer's respiratory in-tensity and respiratory frequency can be realized.In addition,the piezoelectric properties of PVDF nanofiber membranes were determined to be related to the content ofβ-phase crystals by XRD,FT-IR,TG and other analysis methods,which provided a basis for further improving t

关 键 词：聚偏氟乙烯 传感模块 呼吸信号 监测 口罩 

分 类 号：TD74[矿业工程—矿井通风与安全]